170 (number)
From Wikipedia, the free encyclopedia
170 is the natural number following 169 and preceding 171.
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| Ordinal | One hundred [and] seventy |
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| Cardinal | 170th | ||
| Factorization |  |
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| Roman numeral | CLXX | ||
| Binary | 10101010 | ||
| Hexadecimal | AA | ||
One hundred [and] seventy is a sphenic number. It is the smallest n for which φ(n) and σ(n) are both square. But 170 is never a solution for φ(x), making it a nontotient. Nor is it ever a solution to x - φ(x), making it a noncototient. 170 is a repdigit in base 4 (2222).
One hundred [and] seventy is also
- The designation of a spur route of Interstate 70.
- The year AD 170 or 170 BC.
